docs(self-hosted): Specify 'localhost' on the noProxy list (#16024)

## DESCRIBE YOUR PR
A user reported that 'localhost' should be specified on the noProxy list
(getsentry/self-hosted#3947 (comment)).
Although we have 127.0.0.1/8 there. Not sure if this is really needed
tho, but hey if it works, then it works?

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Author: aldy505

develop-docs/self-hosted/index.mdx

@@ -142,7 +142,7 @@ By default Sentry sends anonymous usage statistics to the Sentry team. It helps
     "default": {
       "httpProxy": "http://proxy:3128",
       "httpsProxy": "http://proxy:3128",
-      "noProxy": "smtp,memcached,redis,postgres,pgbouncer,kafka,clickhouse,seaweedfs,snuba-api,symbolicator,web,worker,nginx,relay,vroom,taskbroker,172.17.0.0/16,127.0.0.0/8"
+      "noProxy": "localhost,smtp,memcached,redis,postgres,pgbouncer,kafka,clickhouse,seaweedfs,snuba-api,symbolicator,web,worker,nginx,relay,vroom,taskbroker,172.17.0.0/16,127.0.0.0/8"
     }
   }
 }